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TREVOR CLIFFORD PHOTOGRAPHY / SCIENCE PHOTO LIBRARY TREVOR CLIFFORD PHOTOGRAPHY / SCIENCE PHOTO LIBRARY
Respiration experiment. School student breathing through a tube into a test tube containing lime water (calcium hydroxide solution). Carbon dioxide (CO2) passed into limewater produces a milky suspension of calcium carbonate. As there is a high percentage of carbon dioxide in exhaled air, the lime water turns milky when.
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